If you follow the tutorial here created by Nick Darnell from Epic:
And create a Drag and Drop widget it will work in the preview and mobile preview, but once you package it and try it on iOS it crashes once it gets to the ‘Create DragDropOperation’ node in the blueprint.
I have confirmed this in a new empty Project.
I read a post somewhere that was made in early November that this wasn’t a tested area (mobile and drag and drop) but I thought i’d post this issue anyways.
I also thought about making my own Drag and Drop to get around this (the detect drag works, so I could still use that part), I would just create the drag widget add it to the canvas and update its position based on the mouse and if the mouse button was being held, but what would be the best way to know the widget you are hovering over in a Drag?